b31, Creeping Darkness in the arena leads to error messages

[bricks]

Not sure how or why this onset, but Creeping Darkness somehow led to error messages in the arena. It may have been a consequence of using it near the map edge/while a door was open. Saving and reloading made it a lot worse, I'm now getting around eight error messages every time a turn passes. Otherwise, there are no other issues.

Incidentally, is there a way to disable error messages? I'm right at level 30 of the short arena :/.